Landfill and Environmental Costs - Final Capping, Closure and Post-Closure Costs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Activity in asset retirement obligation liabilities, which includes liabilities for final capping, closure and post-closure
Asset retirement obligation liabilities, beginning of year			$ 1,507.3	$ 1,346.4
Non-cash additions			43.2	35.4
Acquisitions, net of divestitures and other adjustments			88.5	32.4
Asset retirement obligation adjustments			7.2	10.2
Payments			(35.6)	(41.2)
Accretion expense	$ 22.8	$ 20.8	66.9	61.9
Asset retirement obligation liabilities, end of period	1,677.5	1,445.1	1,677.5	1,445.1
Less: current portion	(71.6)	(62.9)	(71.6)	(62.9)
Long-term portion	$ 1,605.9	$ 1,382.2	$ 1,605.9	$ 1,382.2